// Copyright Steve Streeting 2022
// Released under the MIT license https://opensource.org/license/MIT/
#include "SUDSScriptFactory.h"

#include "PackageTools.h"
#include "SUDSEditorSettings.h"
#include "SUDSEditorVoiceOverTools.h"
#include "SUDSMessageLogger.h"
#include "SUDSScript.h"
#include "AssetRegistry/AssetRegistryModule.h"
#include "EditorFramework/AssetImportData.h"
#include "Internationalization/StringTable.h"
#include "Editor.h"
#include "ObjectTools.h"
#include "Internationalization/StringTableCore.h"


USUDSScriptFactory::USUDSScriptFactory()
{
	SupportedClass = USUDSScript::StaticClass();
	bCreateNew = false;
	bEditorImport = true;
	bText = true;
	Formats.Add(TEXT("sud;SUDS Script File"));
}

UObject* USUDSScriptFactory::FactoryCreateText(UClass* InClass,
	UObject* InParent,
	FName InName,
	EObjectFlags Flags,
	UObject* Context,
	const TCHAR* Type,
	const TCHAR*& Buffer,
	const TCHAR* BufferEnd,
	FFeedbackContext* Warn)
{
	Flags |= RF_Transactional;
	FSUDSMessageLogger::ClearMessages();
	FSUDSMessageLogger Logger;

	USUDSScript* Result = nullptr;

	GEditor->GetEditorSubsystem<UImportSubsystem>()->BroadcastAssetPreImport(this, InClass, InParent, InName, Type);
	
	const FString FactoryCurrentFilename = UFactory::GetCurrentFilename();
	FString CurrentSourcePath;
	FString FilenameNoExtension;
	FString UnusedExtension;
	FPaths::Split(FactoryCurrentFilename, CurrentSourcePath, FilenameNoExtension, UnusedExtension);
	const FString LongPackagePath = FPackageName::GetLongPackagePath(InParent->GetOutermost()->GetPathName());
	
	const FString NameForErrors(InName.ToString());

	// Now parse this using utility
	if(Importer.ImportFromBuffer(Buffer, BufferEnd - Buffer, NameForErrors, &Logger, false))
	{
		
		// Populate with data
		Result = NewObject<USUDSScript>(InParent, InName, Flags);
		UStringTable* StringTable = CreateStringTable(InParent, InName, Result, Flags, &Logger);
		Importer.PopulateAsset(Result, StringTable);
		
		// Register source info
		const FMD5Hash Hash = FSUDSScriptImporter::CalculateHash(Buffer, BufferEnd - Buffer);
		Result->AssetImportData->Update(FactoryCurrentFilename, Hash);

		// VO assets at import time?
		if (ShouldGenerateVoiceAssets(LongPackagePath))
		{
			FSUDSEditorVoiceOverTools::GenerateAssets(Result, Flags, &Logger);
		}

	}

	GEditor->GetEditorSubsystem<UImportSubsystem>()->BroadcastAssetPostImport(this, Result);

	return Result;
}

bool USUDSScriptFactory::ShouldGenerateVoiceAssets(const FString& PackagePath) const
{
	if (auto Settings = GetDefault<USUDSEditorSettings>())
	{
		return Settings->ShouldGenerateVoiceAssets(PackagePath);
	}
	return false;
}

UStringTable* USUDSScriptFactory::CreateStringTable(UObject* ScriptParent, FName InName, USUDSScript* Script, EObjectFlags Flags, FSUDSMessageLogger* Logger)
{
	auto Settings = GetDefault<USUDSEditorSettings>();
	const bool bCreateSeparatePackage = Settings && Settings->bCreateStringTablesAsSeparatePackages;

	const FName StringTableName = FName(InName.ToString() + "Strings");
	UStringTable* Table = nullptr;
	auto Registry = &FModuleManager::LoadModuleChecked<FAssetRegistryModule>(AssetRegistryConstants::ModuleName).Get();
	const FString PackageDir = FPackageName::GetLongPackagePath(Script->GetOuter()->GetOutermost()->GetPathName());
	const FString PackageName = UPackageTools::SanitizePackageName(PackageDir / StringTableName.ToString());

	if (bCreateSeparatePackage)
	{
		
		// Create string table as its own package (.uasset)

		{
			// Destroy any string table packed together with the script
			const FString ScriptPackageName = Script->GetPackage()->GetPathName();
			TArray<FAssetData> ScriptAssets;
			Registry->GetAssetsByPackageName(*ScriptPackageName, ScriptAssets);
			TArray<UObject*> StringTableAssets;
			for (auto& Asset : ScriptAssets)
			{
				if (Asset.GetClass() == UStringTable::StaticClass())
				{
					StringTableAssets.Add(Asset.GetAsset());
				}
			}
			if (StringTableAssets.Num() > 0)
			{
				ObjectTools::ForceDeleteObjects(StringTableAssets, false );
			}
		}


		if (FPackageName::DoesPackageExist(*PackageName))
		{
			// Package already exists, so try and import over the top of it, if it doesn't already have a source file path
			TArray<FAssetData> Assets;
			if (Registry->GetAssetsByPackageName(*PackageName, Assets))
			{
				if (Assets.Num() > 0)
				{
					if (Assets[0].GetAsset()->IsA(UStringTable::StaticClass()))
					{
						Table = Cast<UStringTable>(Assets[0].GetAsset());
						Table->GetMutableStringTable()->ClearSourceStrings();
						Table->MarkPackageDirty();
					}
					else
					{
						Logger->Logf(ELogVerbosity::Error,
									 TEXT(
										 "Asset %s already exists but is not a String Table! Cannot replace, please move aside and re-import script."),
									 *PackageName);
						return nullptr;
					}
				}
			}
		}

		if (!Table)
		{
			// String Table didn't exist (although package might have)
			// It's safe to call CreatePackage either way, it'll return the existing one if needed
			UPackage* Package = CreatePackage(*PackageName);
			if (!ensure(Package))
			{
				Logger->Logf(ELogVerbosity::Error,
							 TEXT("Failed to create/retrieve package for string table %s"),
							 *PackageName);
			}
			else
			{
				//Logger->Logf(ELogVerbosity::Display, TEXT("Creating string table %s"), *PackageName);

				// This constructor registers the string table with FStringTableRegistry
				Table = NewObject<UStringTable>(Package, StringTableName, Flags);
				Package->FullyLoad();
				Table->MarkPackageDirty();
				FAssetRegistryModule::AssetCreated(Table);
			}
		}
	}
	else
	{
		// Destroy separate strings package if it exists (could flip this option off after importing)
		if (FPackageName::DoesPackageExist(*PackageName))
		{
			TArray<FAssetData> Assets;
			if (Registry->GetAssetsByPackageName(*PackageName, Assets))
			{
				if (Assets.Num() > 0)
				{
					// Note: we need to force deletion because old string table will be referenced
					// Unfortunately there is no ObjectTools::ForceDeleteAssets, only the inner
					// ForceDeleteObjects, so we need to do it ourselves
					ForceDeleteAssets(Assets);

				}
			}
		}
		
		// Default route, create string table inside script package
		Table = NewObject<UStringTable>(ScriptParent, StringTableName, Flags);

	}
		
	return Table;
	
}

void USUDSScriptFactory::ForceDeleteAssets(const TArray<FAssetData>& AssetsToDelete)
{
	// Copied from ObjectTools::DeleteAssets, except that we're using ForceDeleteObjects so we
	// don't have to display any confusing messages about moving the string table into the shared asset
	
	TArray<TWeakObjectPtr<UPackage>> PackageFilesToDelete;
	TArray<UObject*> ObjectsToDelete;
	for ( int i = 0; i < AssetsToDelete.Num(); i++ )
	{
		const FAssetData& AssetData = AssetsToDelete[i];
		UObject *ObjectToDelete = AssetData.GetAsset({ ULevel::LoadAllExternalObjectsTag });
		// Assets can be loaded even when their underlying type/class no longer exists...
		if ( ObjectToDelete!=nullptr )
		{
			ObjectsToDelete.Add( ObjectToDelete );
		}
		else if ( AssetData.IsUAsset() )
		{
			// ... In this cases there is no underlying asset or type so remove the package itself directly after confirming it's valid to do so.
			FString PackageFilename;
			if( !FPackageName::DoesPackageExist( AssetData.PackageName.ToString(), &PackageFilename ) )
			{
				// Could not determine filename for package so we can not delete
				continue;
			}

			UPackage* Package = FindPackage(nullptr, *AssetData.PackageName.ToString());
			if ( Package )
			{
				PackageFilesToDelete.Add(Package);
			}
		}
	}

	int32 NumObjectsToDelete = ObjectsToDelete.Num();
	if ( NumObjectsToDelete > 0 )
	{
		ObjectTools::ForceDeleteObjects( ObjectsToDelete, false );
	}

	const int32 NumPackagesToDelete = PackageFilesToDelete.Num();
	if (NumPackagesToDelete > 0)
	{
		TArray<UPackage*> PackagePointers;
		for ( const auto& PkgIt : PackageFilesToDelete )
		{
			UPackage* Package = PkgIt.Get();
			if ( Package )
			{
				PackagePointers.Add(Package);
			}
		}

		if ( PackagePointers.Num() > 0 )
		{
			const bool bPerformReferenceCheck = true;
			ObjectTools::CleanupAfterSuccessfulDelete(PackagePointers, bPerformReferenceCheck);
		}
	}
}